To use continental formatting for decimal and numeric data: e.g. 200,12 where English uses 200.12, set the following:

A4GL_ALLOWCOMMAINDECIMAL=Y
A4GL_NUMERIC=,.
LANG=it_IT.UTF-8

The example is Italian. Set LANG appropriately for your country.

Similarly you can set:

A4GL_DB_NUMERIC

A4GL_SCANF_NUMERIC

See the chapter on Environment Variables.